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Palaeoart illustration of an extinct, benthic crinoid with a segmented column and feathery arms, gripping a rocky substrate underwater.

Palaeoart illustration of an extinct, benthic crinoid with a segmented column and feathery arms, gripping a rocky substrate underwater.

Palaeoart of an extinct, benthic crinoid from the Ordovician period. Emphasize its robust, segmented column (stem) with a visible central canal, terminating in a disc-like holdfast gripping a rocky substrate. Above the stem, depict a small, globe-shaped calyx (theca) composed of numerous, irregularly arranged polygonal plates. From the calyx, show a few short, simple, biserial brachials (arms) with feathery pinnules extended into the water for suspension feeding. Underwater scene with dim, filtered light. See more